To round up a number in Python, use the math.ceil() function from the math module. This function always rounds a number up to the nearest integer, regardless of its decimal value.

import math

number = 3.2
rounded_up = math.ceil(number)
print(rounded_up)  # Output: 4

Rounding up to a specific number of decimal places

To round up to a specific number of decimal places, multiply the number by a power of 10, apply math.ceil(), then divide by the same power of 10.

import math

def round_up(number, decimal_places=0):
    multiplier = 10 ** decimal_places
    return math.ceil(number * multiplier) / multiplier

# Example: Round 3.245 up to 2 decimal places
result = round_up(3.245, decimal_places=2)
print(result)  # Output: 3.25

Rounding up a list of numbers

Use a list comprehension with math.ceil() to round up all numbers in a list:

import math

numbers = [1.2, 2.5, 3.9, 4.1]
rounded_up_numbers = [math.ceil(num) for num in numbers]
print(rounded_up_numbers)  # Output: [2, 3, 4, 5]

Note: The built-in round() function does not always round up—it rounds to the nearest integer or decimal place. For guaranteed upward rounding, math.ceil() is the correct choice.